EP0496902A1 - Système et procédé à base de connaissance pour la recherche de molécules - Google Patents
Système et procédé à base de connaissance pour la recherche de molécules Download PDFInfo
- Publication number
- EP0496902A1 EP0496902A1 EP91101016A EP91101016A EP0496902A1 EP 0496902 A1 EP0496902 A1 EP 0496902A1 EP 91101016 A EP91101016 A EP 91101016A EP 91101016 A EP91101016 A EP 91101016A EP 0496902 A1 EP0496902 A1 EP 0496902A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- molecular
- matching
- molecules
- database
- similarity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16C—COMPUTATIONAL CHEMISTRY; CHEMOINFORMATICS; COMPUTATIONAL MATERIALS SCIENCE
- G16C20/00—Chemoinformatics, i.e. ICT specially adapted for the handling of physicochemical or structural data of chemical particles, elements, compounds or mixtures
- G16C20/40—Searching chemical structures or physicochemical data
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S707/00—Data processing: database and file management or data structures
- Y10S707/99931—Database or file accessing
- Y10S707/99933—Query processing, i.e. searching
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S707/00—Data processing: database and file management or data structures
- Y10S707/99941—Database schema or data structure
- Y10S707/99944—Object-oriented database structure
- Y10S707/99945—Object-oriented database structure processing
Definitions
- the invention relates to the Computer Aided Molecular Design (CAMD) field and, more particularly, to those systems and methods that automatically allow the retrieval of molecules previously stored into a molecular database.
- CAMD Computer Aided Molecular Design
- the invention relates to a knowledge base molecular retrieval system and method allowing queries for similarity in structure and properties which can be evaluated on whatever molecular substructure in whatever database.
- the invention makes use of a knowledge base of chemical and physical properties associated with the molecular database. Such a coupling between knowledge base and data base allows to deal with non trivial queries so as to end up in the retrieval of information inaccessible with standard techniques.
- the molecular design process is generally considered a hard task involving hundreds of experiments needed to synthesize one optimal molecule.
- chemical and pharmaceutical industries look forward to having new computer tools useful to assist the scientist in such a process.
- Molecular databases are, among other tools, one of the most widespread.
- a number of molecular databases are presently available on the market; such databases integrate large amounts of molecules collected from different experimentations.
- a frequent use of molecular databases consists in retrieving a set of target molecules in some aspect similar to an input one so as to allow the study of such a class of molecules without further experimentations.
- the invention as claimed is intended to remedy these drawbacks. It solves the problem of scientists who require more powerful molecular retrieval tools, allowing them to make queries in a selective way so as to easily reflect molecular similarity and effectively use the information stored into the database.
- Another advantage offered by the invention is that the preliminary analysis of molecules and the storing of similarity features into the databases is not needed.
- the system and method allow to satisfy a number of queries concerning:
- Figure 1 shows the hardware of the molecular retrieval system which includes a CPU 11 of the general purpose type communicating with a storage 12 containing instructions that control its operation. Moreover, CPU 11 communicates with a storage 13 which contains a knowledge base where a number of chemical and physical properties is associated to a set of molecular fragments. Such fragments have been sorted into three dictionaries: a residue dictionary (the RS-dictionary), a functional group dictionary (the FG-dictionary) and an atom type dictionary (the AT-dictionary). Instruction storage 12 and knowledge base storage 13 may be of the read only storage or random access storage type.
- CPU 11 is also in communication with a main storage 14 of the random access storage type which is used for storing both the source database 22 and the target database 23 of Figure 2.
- Input storage 15 is used to store the query entered from a source not shown in Figure 1.
- Output storage 16 is used to memorize the results of the query.
- a set of programs manipulates the input query so as to retrieve via similarity matching the searched molecules.
- the logical architecture of the system is illustrated in Figure 2.
- Subsystem 2a made of modules 21, 22, 23, 24 will be firstly described.
- Subsystem 2a is used whenever 8 source database is associated with the retrieval system of the invention here described so as to generate a target database that will be the database effectively utilized during the retrieval process.
- the generation of the target database 23 must be viewed as a one time only reformulation process.
- a molecular fragment recognizer module 21 is in communication with both a source database 22 and a target database 23, both stored in a main storage 14. Module 21 also communicates with a knowledge base 24 stored in storage 13.
- Molecular fragment recognizer 21 analyzes one or more source molecules to generate as output a hierarchical description of the source molecule (see below).
- Module 22 is a source database, i.e. the database to be associated with the information retrieval system. Molecules, in source database 22, are required to be described in terms of atoms and connectivities.
- Target database 23 is a database containing a hierarchically representation of each of the molecules stored into source database 22. Such a representation comprises three levels of description: the molecule described in terms of residues, the molecule described in terms of functional groups and the molecule described in terms of atomic entities.
- Knowledge-base 24 is a dictionary of fragments having associated a number of well known chemical and physical properties. Specifically, the system makes use of a number of dictionaries corresponding to the number of representational levels above described (24a,24b,24c).
- module 21 reads each of the molecules stored in terms of atomic entities into source database 22. Then, it makes use of RS-dictionary 24a and FG-dictionary 24b embedded into the knowledge base 24 to recognize the corresponding fragments inside the molecule. As a final result, a three level description of each molecule is generated and stored into target database 23. Whenever, during this process, fragments cannot be recognized neither as residues nor as functional groups, the formalization in terms of atomic entities is used to describe the remaining of the molecule.
- Knowledge base 24 allows the system to accomplish such a step insofar as it allows the system to have a "perception" of the molecules as hierarchical entities with different representations of the molecule associated at each level of the hierarchy.
- Figure 3 illustrates the hierarchical representation of a molecule obtained after this step.
- a molecule is described in terms of a graph in which nodes can be or all residues, or all functional groups, or all atoms, and arcs stand for the connectivities between the said molecular fragments.
- atomic entities are used to represent the molecule at the lower level (the AT-graph); in the following one, the molecule is represented in terms of larger fragments named functional groups such as, for instance, a carboxyl group (the FG-graph); at the next level up, the molecule is described in terms of residues such as, for instance, an amino acid in a peptide (the RS-graph); finally, it is always possible to represent the molecule as a whole with some properties associated to the molecule such as, for instance, the molecular weight.
- FIG 3 when read from left to right, illustrates firstly the AT-graph, then the FG-graph and, finally, the RS-graph; each circled region is in one-to-one correspondence to the circled region of the next hierarchical level.
- the hierarchical representation here described is an extension of the representation adopted by the MIDAS database system as presented by T. E. Ferrin et al. in the Journal of Molecular Graphics, vol. 6, March 1988, pp. 1-12.
- the molecular retrieval process starts when the user interface 28 receives the query to be processed from an input means not shown in Figure 1 (keyboard, magnetic tape reader, diskette drive, etc.).
- User interface 28 is in communication with a query analyzer 25 for the analysis of the query.
- Query analyzer 25 is connected with a structural matching module 26 and a model matching module 27.
- Structural matching module 26 is also connected to a graph matching module 29.
- Query analyzer 25 is the control module, which selects the appropriate subroutines according to the query type entered into the system.
- Knowledge base 24 has been partially illustrated during the description of the subsystem 2a.
- module 24 comprises a number of dictionaries corresponding to the number of representational levels above described.
- Each dictionary is made of a set of fragments with a number of chemical and physical properties associated to each fragment.
- the hydroxyl group for instance, appears into FG-dictionary 24b being described as a hydrophilic group with the property of being electron donor.
- Table 1 Table 2 and Table 3, respectively, are the lists of properties presently being considered into modules 24c, 24b and 24a.
- Structural matching module 26 and model matching module 27 are both used to test whether there are one or more molecules into target database 23 that satisfy the user query. Each of them is selected according to the query type entered by the user (see below).
- Graph matching module 29, finally, is a graph matching subroutine used to match molecules described at any level of representation one onto the other.
- the operation of the subsystem 2b made of modules 24, 25, 26, 27, 28, 29 is here described.
- a query is entered into module 28, it is processed in order to reformulate it in a standard form (the query statement). Such a step is necessary insofar as the user is normally supposed to enter the query in a graphical mode (see, for instance, Figure 4).
- the query statement is presented to query analyzer 25 in order to activate the appropriate routines for satisfying the user query.
- it analyzes the input query to understand the query type.
- Query analyzer 25, according to the input query will select a number of subroutines implemented to deal with the given query.
- Module 25 has been designed to deal with four query types. The operation of the retrieval system is described in connection with each query type.
- the answer to the query is dispatched by query analyzer 25 to user interface 28.
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Bioinformatics & Computational Biology (AREA)
- Computing Systems (AREA)
- Theoretical Computer Science (AREA)
- Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP91101016A EP0496902A1 (fr) | 1991-01-26 | 1991-01-26 | Système et procédé à base de connaissance pour la recherche de molécules |
JP3261950A JPH0792804B2 (ja) | 1991-01-26 | 1991-10-09 | 分子検索方法およびシステム |
US07/824,629 US5418944A (en) | 1991-01-26 | 1992-01-23 | Knowledge-based molecular retrieval system and method using a hierarchy of molecular structures in the knowledge base |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP91101016A EP0496902A1 (fr) | 1991-01-26 | 1991-01-26 | Système et procédé à base de connaissance pour la recherche de molécules |
US07/824,629 US5418944A (en) | 1991-01-26 | 1992-01-23 | Knowledge-based molecular retrieval system and method using a hierarchy of molecular structures in the knowledge base |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0496902A1 true EP0496902A1 (fr) | 1992-08-05 |
Family
ID=26128699
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91101016A Withdrawn EP0496902A1 (fr) | 1991-01-26 | 1991-01-26 | Système et procédé à base de connaissance pour la recherche de molécules |
Country Status (3)
Country | Link |
---|---|
US (1) | US5418944A (fr) |
EP (1) | EP0496902A1 (fr) |
JP (1) | JPH0792804B2 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997014106A1 (fr) * | 1995-10-13 | 1997-04-17 | Terrapin Technologies, Inc. | Identification d'activite chimique commune par comparaison de fragments substructuraux |
WO1999035599A1 (fr) * | 1998-01-09 | 1999-07-15 | Everett, Richard, Stephen, Hans | Dispositif et procede utilises dans la production de composes chimiques |
WO2002041179A2 (fr) * | 2000-11-17 | 2002-05-23 | Amedis Pharmaceuticals Limited | Procede de generation d'une base de donnees de fragments moleculaires |
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US5995908A (en) * | 1990-09-20 | 1999-11-30 | Margaret I. Pullen | Integrated field modeling system |
US5615112A (en) * | 1993-01-29 | 1997-03-25 | Arizona Board Of Regents | Synthesized object-oriented entity-relationship (SOOER) model for coupled knowledge-base/database of image retrieval expert system (IRES) |
US5577239A (en) * | 1994-08-10 | 1996-11-19 | Moore; Jeffrey | Chemical structure storage, searching and retrieval system |
US5657255C1 (en) * | 1995-04-14 | 2002-06-11 | Interleukin Genetics Inc | Hierarchic biological modelling system and method |
US5752019A (en) * | 1995-12-22 | 1998-05-12 | International Business Machines Corporation | System and method for confirmationally-flexible molecular identification |
WO1997027559A1 (fr) | 1996-01-26 | 1997-07-31 | Patterson David E | Procede pour creer une bibliotheque moleculaire virtuelle et procede pour y faire des recherches, en utilisant des descripteurs valides de structure moleculaire |
US6185506B1 (en) * | 1996-01-26 | 2001-02-06 | Tripos, Inc. | Method for selecting an optimally diverse library of small molecules based on validated molecular structural descriptors |
US5880972A (en) * | 1996-02-26 | 1999-03-09 | Pharmacopeia, Inc. | Method and apparatus for generating and representing combinatorial chemistry libraries |
US5989835A (en) | 1997-02-27 | 1999-11-23 | Cellomics, Inc. | System for cell-based screening |
US5751605A (en) * | 1996-08-15 | 1998-05-12 | Tripos, Inc. | Molecular hologram QSAR |
US6189013B1 (en) | 1996-12-12 | 2001-02-13 | Incyte Genomics, Inc. | Project-based full length biomolecular sequence database |
US6023659A (en) * | 1996-10-10 | 2000-02-08 | Incyte Pharmaceuticals, Inc. | Database system employing protein function hierarchies for viewing biomolecular sequence data |
US6519583B1 (en) | 1997-05-15 | 2003-02-11 | Incyte Pharmaceuticals, Inc. | Graphical viewer for biomolecular sequence data |
JPH10221728A (ja) * | 1997-02-07 | 1998-08-21 | Canon Inc | ぶれ補正光学手段付きレンズ鏡筒 |
WO1998047087A1 (fr) * | 1997-04-17 | 1998-10-22 | Glaxo Group Ltd. | Deconvolution statistique de melanges |
US6611828B1 (en) | 1997-05-15 | 2003-08-26 | Incyte Genomics, Inc. | Graphical viewer for biomolecular sequence data |
US6182016B1 (en) | 1997-08-22 | 2001-01-30 | Jie Liang | Molecular classification for property prediction |
CA2308115A1 (fr) * | 1997-10-24 | 1999-05-06 | University Of Utah Research Foundation | Interaction de peptides d'alpha-conotoxine avec des recepteurs neuraux d'acetylcholine nicotinique |
US6051029A (en) * | 1997-10-31 | 2000-04-18 | Entelos, Inc. | Method of generating a display for a dynamic simulation model utilizing node and link representations |
US6078739A (en) * | 1997-11-25 | 2000-06-20 | Entelos, Inc. | Method of managing objects and parameter values associated with the objects within a simulation model |
US6069629A (en) * | 1997-11-25 | 2000-05-30 | Entelos, Inc. | Method of providing access to object parameters within a simulation model |
US6408308B1 (en) * | 1998-01-29 | 2002-06-18 | Incyte Pharmaceuticals, Inc. | System and method for generating, analyzing and storing normalized expression datasets from raw expression datasets derived from microarray includes nucleic acid probe sequences |
AU5096499A (en) * | 1998-07-13 | 2000-02-01 | Glaxo Group Limited | Chemical compound information system |
US6654736B1 (en) * | 1998-11-09 | 2003-11-25 | The United States Of America As Represented By The Secretary Of The Army | Chemical information systems |
JP2002530748A (ja) * | 1998-11-13 | 2002-09-17 | セロミックス インコーポレイテッド | 実験データを効率的に収集して記憶するための方法及びシステム |
US6434545B1 (en) | 1998-12-16 | 2002-08-13 | Microsoft Corporation | Graphical query analyzer |
US6323852B1 (en) * | 1999-01-04 | 2001-11-27 | Leadscope, Inc. | Method of analyzing organizing and visualizing chemical data with feature hierarchy |
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WO2000063793A2 (fr) * | 1999-04-16 | 2000-10-26 | Entelos, Inc. | Procede et appareil pour effectuer des operations de simulation liees a l'aide d'un modele de systeme informatise |
US6665685B1 (en) * | 1999-11-01 | 2003-12-16 | Cambridge Soft Corporation | Deriving database interaction software |
WO2001055951A2 (fr) | 2000-01-25 | 2001-08-02 | Cellomics, Inc. | Procede et systeme de creation d'inferences automatisees des connaissances d'interaction physico-chimiques provenant de bases de donnees de donnees de co-occurrences |
US6907350B2 (en) * | 2000-03-13 | 2005-06-14 | Chugai Seiyaku Kabushiki Kaisha | Method, system and apparatus for handling information on chemical substances |
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DE10043853A1 (de) * | 2000-09-06 | 2002-03-14 | Merck Patent Gmbh | Verfahren zur Erstellung von Synthesepfaden |
US6813615B1 (en) | 2000-09-06 | 2004-11-02 | Cellomics, Inc. | Method and system for interpreting and validating experimental data with automated reasoning |
US7330793B2 (en) * | 2001-04-02 | 2008-02-12 | Cramer Richard D | Method for searching heterogeneous compound databases using topomeric shape descriptors and pharmacophoric features |
US7155453B2 (en) * | 2002-05-22 | 2006-12-26 | Agilent Technologies, Inc. | Biotechnology information naming system |
KR20030019681A (ko) * | 2001-08-29 | 2003-03-07 | 바이오인포메틱스 주식회사 | 웹 기반 프로테옴 분석 및 관리 시스템 및 그 방법 |
AUPR981002A0 (en) * | 2002-01-02 | 2002-01-31 | Proteome Systems Ltd | 2 Dimensional structure queries |
EP1721268A1 (fr) * | 2004-03-05 | 2006-11-15 | Applied Research Systems ARS Holding N.V. | Procede de recherche rapide dans des substructure de bibliotheques chimiques non enumerees |
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US20090228445A1 (en) * | 2008-03-04 | 2009-09-10 | Systems Biology (1) Pvt. Ltd. | Automated molecular mining and activity prediction using xml schema, xml queries, rule inference and rule engines |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60107554A (ja) * | 1983-11-16 | 1985-06-13 | Ube Ind Ltd | 未知物質の化学構造を決定する方法および装置 |
US4642762A (en) * | 1984-05-25 | 1987-02-10 | American Chemical Society | Storage and retrieval of generic chemical structure representations |
JPS61223941A (ja) * | 1985-03-29 | 1986-10-04 | Kagaku Joho Kyokai | 化学構造の検索方法 |
-
1991
- 1991-01-26 EP EP91101016A patent/EP0496902A1/fr not_active Withdrawn
- 1991-10-09 JP JP3261950A patent/JPH0792804B2/ja not_active Expired - Lifetime
-
1992
- 1992-01-23 US US07/824,629 patent/US5418944A/en not_active Expired - Fee Related
Non-Patent Citations (4)
Title |
---|
COMMUNICATIONS OF THE ASSOCIATION FOR COMPUTING MACHINERY. vol. 30, no. 11, November 1987, NEW YORK US pages 909 - 921; Richard H. Lathrop et al: "Ariadne: Pattern-directed Inference and Hierarchical Abstraction in Protein Structure Recognition" * |
EXPERT SYSTEMS. vol. 6, no. 3, August 1989, OXFORD, GB pages 144 - 156; John A. Brugge et al: "Evolution of a knowledge-based system for determining structural components of proteins" * |
Journal of Molecular Graphics vol. 6, no. 1, March 1988, pages 2 - 12; T.E.Ferrin et al: "The Midas Database System" * |
PARALLEL COMPUTING. vol. 8, no. 1-3, October 1988, AMSTERDAM NL pages 399 - 407; C.A. Pogue et al: "Searching and clustering of databases using the ICL Distributed Array Processor" * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997014106A1 (fr) * | 1995-10-13 | 1997-04-17 | Terrapin Technologies, Inc. | Identification d'activite chimique commune par comparaison de fragments substructuraux |
WO1999035599A1 (fr) * | 1998-01-09 | 1999-07-15 | Everett, Richard, Stephen, Hans | Dispositif et procede utilises dans la production de composes chimiques |
WO2002041179A2 (fr) * | 2000-11-17 | 2002-05-23 | Amedis Pharmaceuticals Limited | Procede de generation d'une base de donnees de fragments moleculaires |
WO2002041179A3 (fr) * | 2000-11-17 | 2004-05-21 | Amedis Pharm Ltd | Procede de generation d'une base de donnees de fragments moleculaires |
Also Published As
Publication number | Publication date |
---|---|
JPH0628409A (ja) | 1994-02-04 |
US5418944A (en) | 1995-05-23 |
JPH0792804B2 (ja) | 1995-10-09 |
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